Development of Novel Low-Fouling RO Membrane

Membrane fouling is one of the most significant problems for the stable operation of reverse osmosis (RO) membranes. To improve low-fouling property of RO membranes, a study of membrane surface was carried out. With the control of hydrated water on membrane surface, a new membrane performed adhesion inhibition of various foulant, such as non-ionic surfactant, anionic surfactant, and cationic surfactant. In cooperation with Toray Singapore Water Research Center, the remarkable reduction of foulants on the membrane surface was observed through optical coherence tomography analysis, and the new membrane performed a superior flux retention than a conventional membrane under a secondary treated sewage.